Inexpensive and Abundant Layered Co-Based Composite Photocatalysts for Hydrogen Production and Theoretical Calculations,ACS Applied Energy Materials

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Inexpensive and Abundant Layered Co-Based Composite Photocatalysts for Hydrogen Production and Theoretical Calculations
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-11-17 , DOI: 10.1021/acsaem.1c02821
Yidong Sun ₁ , Xingpu Wang ₂ , Jun Cao ₁ , Yangwen Shu ₁ , Yong Liu ₁ , Qiang Fu ₃ , Chunxu Pan _{1,

3}

Affiliation

Hydrogen (H₂) is considered to be the most promising clean energy to replace fossil fuels in the future. Layered Co₃S₄ has excellent conductivity, and the Co₃S₄/Zn_0.5Cd_0.5S heterojunction can effectively increase the refraction of light and enhance the separation efficiency of photogenerated carriers for solar energy conversion. Compared with pure Zn_0.5Cd_0.5S, the 10%Co₃S₄/Zn_0.5Cd_0.5S heterojunction exhibits the highest light absorption capacity; the photoelectric current and HER reach 14 μA and 1511 μmol/h/g, respectively, which are 70 and 14.6 times higher than those of pure Zn_0.5Cd_0.5S. A theoretical calculation was carried out to explore Co₃S₄ as a qualified cocatalyst and formation of the Co₃S₄/Zn_0.5Cd_0.5S heterojunction. The mechanism for the photogenerated electron–hole pairs being separated involves the following processes, i.e., the electrons of Co₃S₄ transfer to Zn_0.5Cd_0.5S, while the photogenerated holes that transfer from Zn_0.5Cd_0.5S to the Co₃S₄ valence band combine with lactic acid to form pyruvate. This work provides an experimental design, and the process exhibits advantages, such as simple, environmentally friendly, and possible large-scale production, etc. It is expected to have broad application prospects.

中文翻译：

用于制氢和理论计算的廉价且丰富的层状钴基复合光催化剂

氢（H ₂）被认为是未来替代化石燃料的最有前途的清洁能源。层状Co ₃ S ₄具有优良的导电性，Co ₃ S ₄ /Zn _0.5 Cd _0.5 S异质结可以有效增加光的折射，提高太阳能转换光生载流子的分离效率。与纯Zn _0.5 Cd _0.5 S相比，10%Co ₃ S ₄ /Zn _0.5 Cd _0.5S异质结表现出最高的光吸收能力；光电流和HER分别达到14 μA和1511 μmol/h/g，分别是纯Zn _0.5 Cd _0.5 S的70倍和14.6倍。通过理论计算探索Co ₃ S ₄作为合格品助催化剂和 Co ₃ S ₄ /Zn _0.5 Cd _0.5 S 异质结的形成。光生电子-空穴对分离的机制涉及以下过程，即Co ₃ S ₄的电子转移到Zn _0.5 Cd _0.5S，而从 Zn _0.5 Cd _0.5 S 转移到 Co ₃ S ₄价带的光生空穴与乳酸结合形成丙酮酸。该工作提供了实验设计，该工艺具有简单、环保、可规模化生产等优点，具有广阔的应用前景。

更新日期：2021-12-27

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